The gsettings set org.gnome.desktop.interface gtk-enable-primary-paste true command would be a way of restoring the primary paste (middle click paste) for those desiring the functionality. The decision over the default has been tasked to GNOME's design team for consideration.
Separately, Mozilla is also considering disabling middle mouse button paste by default too. [...] Another option being considered is having the option to enable/disable it at either the GTK toolkit level or Wayland compositor level.
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